Peptide for treating ocular diseases and composition for treating ocular diseases comprising same

ABSTRACT

A pharmaceutical composition for preventing or treating ophthalmopathy is described. More particularly, a composition comprising a peptide derived from telomerase and being effective in treating and preventing ophthalmopathy is described. The peptide derived from telomerase, a peptide having a sequence 80% identical to the sequence thereof, or a peptide as a fragment thereof is superiorly effective in treating ophthalmopathy.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. application Ser. No. 15/539,396, filed Jun. 23, 2017, which is the U.S. national phase of PCT/KR2015/014099, filed Dec. 22, 2015, which claims foreign priority to KR 10-2014-0187531, filed Dec. 22, 2014, which are hereby incorporated by reference herein in its entirety.

REFERENCE TO SEQUENCE LISTING SUBMITTED ELECTRONICALLY VIA EFS-WEB

The content of the electronically submitted sequence listing (Name: 2473_0980001_SeqListing_ST25.txt; 10,386 bytes; and Date of Creation: Sep. 23, 2019) was originally submitted in the International Application No. PCT/KR2015/014099 and is incorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a peptide having a therapeutic effect on ophthalmopathy, and a pharmaceutical composition including the same. More particularly, the present invention relates to a peptide having a therapeutic effect on ophthalmopathy as a peptide derived from telomerase, and a pharmaceutical composition including the same for treating ocular diseases.

Background Art

Age-related macular degeneration is the most serious disease that causes blindness in the elderly over the age of 65 in the West, and has been reported to be an important factor causing amblyopia and blindness due to aging even in the Asian countries. As the population has aged in recent years, the onset of age-related macular degeneration has gradually increased recently in Korea. Thus, the age-related macular degeneration becomes one of diseases having the highest social burden on treatment costs.

Choroidal neovascularization (CNV) shows distinctive signs of wet age-related macular degeneration as neovascularization originating from the choroid, which is caused in a space beneath the retina or retinal epithelium due to the rupture of Bruch's membranes.

No pathophysiology of age-related macular degeneration has been completely found so far. However, various clinical trials and studies show that a vascular endothelial growth factor (VEGF) plays an important role in the onset of choroidal neovascularization. As a result, although laser treatment, photodynamic therapy, and the like have been used in the prior art to treat age-related macular degeneration, current anti-vascular endothelial growth factor antibody (anti-VEGF antibody) injection has established itself as primary therapy, and anti-VEGF antibody drugs such as ranibizumab, bevacizumab, aflibercept, and the like have been used all over the world as a therapeutic agent to treat wet age-related macular degeneration.

Although current primary therapeutic agents for wet age-related macular degeneration are found to be effective for most patients, no one can deny that they have various limitations as injection therapy in which a therapeutic agent is directly intravitreally administered. Because they have a limit on a time at which their medicinal effect lasts in the eyes, patients should receive repeated injection treatments at intervals of as little as one month. It is a big burden on both practitioners and patients for the patients to receive the endless injection treatments due to the nature of continuously recurring choroidal neovascularization even when the choroidal neovascularization is clinically improved.

Another problem is that the onset of geographic retinal atrophy increases when an anti-VEGF antibody injection is repeatedly administered. Also, the repeated intravitreal injection treatments have their limits since they have a risk of various ocular adverse events including slight side effects such as subconjunctival ecchymosis, etc., and severe complications such as endophthalmitis, retinal detachment, increased intraocular pressure, etc.

Also, the social costs associated with expensive antibody injections and injection therapy, the degradation in quality of life of a patient caused by frequent hospital visits, and the practitioners' excessively increased workload are also problems.

However, another big problem is, first of all, that there is a group of patients having no response to the anti-VEGF antibody injection. In the patient group, even when an anti-VEGF antibody is repeatedly injected to some patients, the activity of choroidal neovascularization is not reduced at all from the beginning, and some patients have no improved vision. Some other patients have a response to the anti-VEGF antibody injection at the beginning, but show tachyphylaxis in which the medicinal effect drops. This indirectly suggests that other factors other than the vascular endothelial growth factor are associated with the pathophysiology of choroidal neovascularization. In effect, it is reported that oxidative stress caused by reactive oxygen species (ROS), inflammatory response in tissues, or the like is associated with the onset and growth of choroidal neovascularization. Accordingly, antioxidants, free radical scavengers, steroids, and the like have been developed as therapeutic agents for treating wet age-related macular degeneration, but still play a subsidiary role in the anti-VEGF antibody injection.

SUMMARY OF THE INVENTION Technical Problem

Accordingly, this research proves the validity and safety of telomerase-derived peptides in an animal model of choroidal neovascularization in which the inflammatory response in tissues is a part of the important pathophysiology. An inhibitory effect of the telomerase-derived peptides on choroidal neovascularization is proven through this experiment. Because such peptides are drugs having a different mechanism than the conventional anti-VEGF antibody injections, the peptides may serve as another therapeutic weapon in treating the wet age-related macular degeneration in the future, and are also expected to be applicable to various inflammatory diseases other than the ocular diseases to provide a big help in effectively treating an inflammation without any side effects.

Technical Solution

To achieve the objects of the present invention, according to one aspect of the present invention, there is provided a composition for treating and preventing ophthalmopathy, which includes a peptide selected from a peptide including an amino acid sequence set forth in SEQ ID NO: 1, a peptide having a sequence homology of 80% or more with the amino acid sequence, or a fragment thereof.

In the composition according to one aspect of the present invention, the fragment may be a fragment consisting of three or more amino acids

In the composition according to one aspect of the present invention, the ophthalmopathy may include one or more selected from the group consisting of diabetic retinopathy, retinopathy of prematurity, corneal graft rejection, neovascular glaucoma, rubeosis, proliferative retinopathy, psoriasis, and macular degeneration.

In the composition according to one aspect of the present invention, the ophthalmopathy may be age-related ophthalmopathy.

In the composition according to one aspect of the present invention, the peptide may reduce the activity of a vascular endothelial growth factor (VEGF).

In the composition according to one aspect of the present invention, the peptide may inhibit choroidal neovascularization.

According to another aspect of the present invention, there is provided a composition inhibiting choroidal neovascularization, which includes a peptide selected from a peptide including an amino acid sequence set forth in SEQ ID NO: 1, a peptide having a sequence homology of 80% or more with the amino acid sequence, or a fragment thereof.

In the composition according to another aspect of the present invention, the composition may be a pharmaceutical composition further including a pharmaceutically acceptable excipient and additives.

In the composition according to another aspect of the present invention, the composition may be a food composition.

According to still another aspect of the present invention, there is provided a method of treating and preventing ophthalmopathy, which includes administering the composition for treating and preventing ophthalmopathy to a target.

According to yet another aspect of the present invention, there is provided a kit for treating and preventing ophthalmopathy, which includes the composition for treating and preventing ophthalmopathy, and a manual.

In the kit according to yet another aspect of the present invention, the manual may contain contents regarding the administration of the composition for treating and preventing ophthalmopathy.

According to yet another aspect of the present invention, there is provided a use of the peptide in ophthalmopathy to prepare the composition for treating and preventing ophthalmopathy. Here, the peptide may be selected from a peptide containing an amino acid sequence set forth in SEQ ID NO: 1, a peptide having a sequence homology of 80% or more with the amino acid sequence, or a fragment thereof.

Advantageous Effects of the Invention

According to one exemplary embodiment of the present invention, a composition capable of effectively treating ophthalmopathy can be provided. Therefore, the composition according to one exemplary embodiment of the present invention can be applied to treatment and prevention of ophthalmopathy, and can be particularly used to treat ocular diseases caused by choroidal neovascularization.

Also, the peptide according to one exemplary embodiment of the present invention selected from a peptide containing an amino acid sequence set forth in SEQ ID NO: 1, a peptide having a sequence homology of 80% or more with the amino acid sequence, or a fragment thereof can be effective in treating and preventing ophthalmopathy.

DETAILED DESCRIPTION OF THE DRAWINGS/FIGURES

FIG. 1 is an image showing the comparison of thicknesses of choroidal neovascularization (CNV) in experimental groups after pep1 is administered at different concentrations to the experimental groups in a laser-induced CNV animal model.

FIG. 2 is a graph plotted for thicknesses of CNV in the experimental groups measured after the pep1 is administered at different concentrations to the experimental groups in a laser-induced CNV animal model.

FIG. 3 is an image showing the comparison of areas of choroidal neovascularization (CNV) in experimental groups after pep1 is administered at different concentrations to the experimental groups in a laser-induced CNV animal model.

FIG. 4 is a graph plotted for areas of CNV in the experimental groups measured after the pep1 is administered at different concentrations to the experimental groups in a laser-induced CNV animal model.

FIG. 5 is an image showing the comparison of levels of angiographic leakage in the experimental groups photographed using fluorescein angiography after the pep1 is administered at different concentrations to the experimental groups in a laser-induced CNV animal model.

FIG. 6 is a graph plotted for ratios of lesions in the experimental groups evaluated in grades, each of which represents a level of angiographic leakage, after the pep1 is administered at different concentrations to the experimental groups in a laser-induced CNV animal model.

DETAILED DESCRIPTION OF THE INVENTION Best Mode

The present invention can be variously changed and may have various exemplary embodiments. Hereinafter, the present invention will be described in further detail. However, it should be understood that the certain exemplary embodiments proposed herein are not intended to limit the scope of the present invention and cover all such changes and modifications within the scope of the appended claims and their equivalents. In describing the present invention, detailed descriptions of the prior art related to the present invention will be omitted for clarity when the detailed descriptions are considered to obscure the gist of the present invention.

A telomere is a genetic material that is repeatedly located at the end of each chromosome, and is known to prevent damage of the corresponding chromosome or binding to other chromosomes. Whenever cells divide, the length of telomeres is shortened. When not less than a given number of cell division cycles occur, the telomere is extremely shortened, and the cells do not divide any more, which leads to cell death. On the other hand, it is known that the life span of cells is extended when a telomere is lengthened. For example, it is known that cancer cells continue to proliferate without dying because enzymes referred to as “telomerases” are secreted from the cancer cells to prevent the shortening of telomeres. The present inventors have found that peptides derived from the telomerases have an effect in inhibiting the neovascularization. Therefore, the present invention has been completed based on these facts.

The peptide disclosed in this specification may include a peptide having a sequence homology of 80% or more, 85% or more, 90% or more, 95% or more, 96% or more, 97% or more, 98% or more, and 99% or more. Also, the peptide disclosed in this specification may include a peptide containing an amino acid sequence set forth in SEQ ID NO: 1 or fragments thereof, and peptides in which one or more amino acids, two or more amino acids, three or more amino acids, four or more amino acids, five or more amino acids, six or more amino acids, or seven or more amino acids are changed.

According to one aspect of the present invention, the amino acid changes belong to a nature of the peptide to change its physicochemical characteristics. For example, the amino acid changes may be carried out, for example, by improving heat stability of the peptide, altering substrate specificity, changing an optimal pH level, etc.

In this specification, the term “amino acid” includes 22 standard amino acids naturally integrated into peptides and D-isomers thereof, and modified amino acids. Therefore, according to one aspect of the present invention, the peptide may be a peptide including D-amino acids. Meanwhile, according to another aspect of the present invention, the peptide may include non-standard amino acids subjected to post-translational modification, etc. Examples of the post-translational modification include phosphorylation, glycosylation, acylation (for example, including acetylation, myristoylation, and palmitoylation), alkylation, carboxylation, hydroxylation, glycation, biotinylation, ubiquitinylation, changes in chemical properties (for example, deimidization via β-elimination, deamidation), and structural changes (for example, disulfide bridge formation). Also, the post-translational modification includes changes in amino acids, such as changes in amino acids caused by chemical reactions occurring during the binding to crosslinkers for forming a peptide conjugate, for example, changes in amino groups, carboxyl groups or side chains.

The peptide disclosed in this specification may be a wild-type peptide isolated and separated from a natural source. Meanwhile, the peptide disclosed in this specification may be an artificial variant having an amino acid sequence into which one or more amino acids are substituted, deleted and/or inserted when compared to the peptides that are fragments of the peptide containing an amino acid sequence set forth in SEQ ID NO: 1. The amino acid changes in wild-type polypeptides and artificial variants thereof include conservative amino acid substitution having no significant influence on the folding and/or activities of proteins. Examples of the conservative substitution fall within groups of basic amino acids (arginine, lysine, and histidine), acidic amino acids (glutamic acid and aspartic acid), polar amino acids (glutamine and asparagine), hydrophobic amino acids (leucine, isoleucine, valine, and methionine), aromatic amino acids (phenylalanine, tryptophane, and tyrosine), and small amino acids (glycine, alanine, serine, and threonine). In general, the amino acid substitution in which specific activities are not changed is known in the related art. The most generally occurring replacements include Ala/Ser, Val/Ile, Asp/Glu, Thr/Ser, Ala/Gly, Ala/Thr, Ser/Asn, Ala/Val, Ser/Gly, Tyr/Phe, Ala/Pro, Lys/Arg, Asp/Asn, Leu/Ile, Leu/Val, Ala/Glu, and Asp/Gly replacements, and vice versa. Other examples of the conservative substitutions are listed in the following Table 1.

TABLE 1 Original Preferred amino residue acids Exemplary residue substitution substitution Ala (A) Val; Leu; Ile Val Arg (R) Lys; Gln; Asn Lys Asn (N) Gln; His; Asp, Lys; Arg Gln Asp (D) Glu; Asn Glu Cys (C) Ser; Ala Ser Gln (Q) Asn; Glu Asn Glu (E) Asp; Gln Asp Gly (G) Ala Ala His (H) Asn; Gln; Lys; Arg Arg Ile (I) Leu; Val; Met; Ala; Phe; Norleucine Leu Leu (L) Norleucine; Ile ; Val; Met; Ala; Phe Ile Lys (K) Arg; Gln; Asn Arg Met (M) Leu; Phe; Ile Leu Phe (F) Leu; Val; Ile; Ala; Tyr Tyr Pro (P) Ala Ala Ser (S) Thr Thr Thr (T) Ser Ser Trp (W) Tyr; Phe Tyr Tyr (Y) Trp; Phe; Thr; Ser Phe Val (V) Ile; Leu; Met; Phe; Ala; Norleucine Leu

Substantial changes in biological characteristics of the peptide are carried out by selecting substituted sites which have (a) a considerably different effect in maintaining a structure of a polypeptide backbone in a substituted region, for example, a sheet or helical steric confirmation, (b) a considerably different effect in maintaining charges or hydrophobicity of the molecules in a target site, or (c) a considerably different effect in maintaining the bulk of side chains. Natural residues are divided into groups based on the conventional side chain characteristics:

(1) Hydrophobic residues: Norleucine, Met, Ala, Val, Leu, and Ile;

(2) Neutral hydrophilic residues: Cys, Ser, and Thr;

(3) Acidic residues: Asp, and Glu;

(4) Basic residues: Asn, Gln, His, Lys, and Arg;

(5) Residues having an effect on chain orientation: Gly, and Pro; and

(6) Aromatic residues: Trp, Tyr, and Phe.

Non-conservative substitution will be achieved by exchanging one member in these groups with one in another group. Any cysteine residue which is not associated with the maintenance of a proper steric conformation of the peptide may be generally substituted with serine to improve oxidative stability of the molecules and prevent an erroneous cross-linked bond. Inversely speaking, a cysteine bond(s) may be added to the peptide to improve the stability of the peptide.

Other types of the amino acid variants of the peptide include amino acid variants in which a glycosylation pattern of an antibody is changed. The term “change” refers to a deletion of one or more carbohydrate residues found in a peptide and (or) an addition of one or more glycosylation sites not present in the peptide.

Typically, the glycosylation of the peptide means that a peptide is N-linked or O-linked. The term “N-linked” means that a carbohydrate residue is attached to a side chain of an asparagine residue. Tripeptide sequences asparagine-X-serine and asparagine-X-threonine (wherein X represents any amino acid other than proline) are recognition sequences for enzymatically attaching a carbohydrate residue to a side chain of asparagine. Therefore, a potential glycosylation site is generated when one of such tripeptide sequences is present in a polypeptide. O-linked glycosylation means that one of sugar N-acetylgalactosamine, galactose and xylose is attached to hydroxyamino acid, most typically serine or threonine. However, 5-hydroxyproline or 5-hydroxylysine may also be used.

The addition of the glycosylation site to the peptide may be easily carried out by modifying an amino acid sequence to including at least one of the aforementioned tripeptide sequences (in the case of N-linked glycosylation sites). Such a change may be carried out by adding one or more serine or threonine residues to an initial sequence of an antibody or substituting these residues (in the case of O-linked glycosylation sites).

Also, the peptide having a sequence set forth in SEQ ID NO: 1 according to one aspect of the present invention, peptides as the fragments of the peptide having a sequence of SEQ ID NO: 1, or peptides having a sequence homology of 80% or more with the peptide sequence has an advantage in that the peptides have low toxicity in cells and high in vivo stability. In the present invention, the peptide having a sequence set forth in SEQ ID NO: 1 is a telomerase-derived peptide that consists of 16 amino acids, as described below.

The peptide having a sequence set forth in SEQ ID NO: 1 is listed in the following Table 2. In the following Table 2, the “name” is used to differentiate peptides from each other. According to one aspect of the present invention, the peptide having a sequence set forth in SEQ ID NO: 1 represents a full-length peptide of a human telomerase. According to another aspect of the present invention, the peptide having a sequence set forth in SEQ ID NO: 1, the peptides as the fragments of the peptide having a sequence of SEQ ID NO: 1, or the peptides having a sequence homology of 80% or more with the peptide sequence includes “synthetic peptides” synthesized after a peptide at a corresponding position is selected from peptides included in the telomerase. SEQ ID NO: 2 represents a full-length amino acid sequence of the telomerase.

TABLE 2 SEQ Location on ID NO Name telomerase Sequence Length 1 pep1 [611-626] EARPALLTSRLRFIPK    16 aa 2   [1-1132] MPRAPRCRAVRSLLRSHYREVLPLATFVR 1,132 aa RLGPQGWRLVQRGDPAAFRALVAQCLVCV PWDARPPPAAPSFRQVSCLKELVARVLQR LCERGAKNVLAFGFALLDGARGGPPEAFT TSVRSYLPNTVTDALRGSGAWGLLLRRVG DDVLVHLLARCALFVLVAPSCAYQVCGPP LYQLGAATQARPPPHASGPRRRLGCERAW NHSVREAGVPLGLPAPGARRRGGSASRSL PLPKRPRRGAAPEPERTPVGQGSWARPGR TRGPSDRGFCVVSPARPAEEATSLEGALS GTRHSHPSVGRQHHAGPPSTSRPPRPWDT PCPPVYAETKHFLYSSGDKEQLRPSFLLS SLRPSLTGARRLVETIFLGSRPWMPGTPR RLPRLPQRYWQMRPLFLELLGNHAQCPYG VLLKTHCPLRAAVTPAAGVCAREKPQGSV AAPEEEDTDPRRLVQLLRQHSSPWQVYGF VRACLRRLVPPGLWGSRHNERRFLRNTKK FISLGKHAKLSLQELTWKMSVRDCAWLRR SPGVGCVPAAEHRLREEILAKFLHWLMSV YVVELLRSFFYVTETTFQKNRLFFYRKSV WSKLQSIGIRQHLKRVQLRELSEAEVRQH REARPALLTSRLRFIPKPDGLRPIVNMDY VVGARTFRREKRAERLTSRVKALFSVLNY ERARRPGLLGASVLGLDDIHRAWRTFVLR VRAQDPPPELYFVKVDVTGAYDTIPQDRL TEVIASIIKPQNTYCVRRYAVVQKAAHGH VRKAFKSHVSTLTDLQPYMRQFVAHLQET SPLRDAVVIEQSSSLNEASSGLFDVFLRF MCHHAVRIRGKSYVQCQGIPQGSILSTLL CSLCYGDMENKLFAGIRRDGLLLRLVDDF LLVTPHLTHAKTFLRTLVRGVPEYGCVVN LRKTVVNFPVEDEALGGTAFVQMPAHGLF PWCGLLLDTRTLEVQSDYSSYARTSIRAS LTFNRGFKAGRNMRRKLFGVLRLKCHSLF LDLQVNSLQTVCTNIYKILLLQAYRFHAC VLQLPFHQQVWKNPTFFLRVISDTASLCY SILKAKNAGMSLGAKGAAGPLPSEAVQWL CHQAFLLKLTRHRVTYVPLLGSLRTAQTQ LSRKLPGTTLTALEAAANPALPSDFKTIL D

A laser-induced experimental CNV model used in an experiment of the present invention is an animal model which has been most widely used to realize human wet age-related macular degeneration in rats. The rupture of Bruch's membranes may be induced with lasers and neovascularization may grow from the choroid to promote an environment similar to that of the human choroidal neovascularization. Although the human wet age-related macular degeneration caused by chronic, genetic and environmental complex factors, and choroidal neovascularization caused with acute damage with lasers in an animal model cannot be evaluated equally, this animal model plays a critical role as a method of primarily evaluating all age-related macular degeneration therapeutic agents.

In this specification, an experiment is carried out, as follows. In a laser-induced experimental CNV model, pep1 that is a telomerase-derived peptide is administered to determine whether the activities evaluated as a thickness, an area, a leakage level and the like of the choroidal neovascularization are reduced, compared to the control in which a vehicle is administered alone.

According to one aspect of the present invention, a pharmaceutical composition including the peptide as an active ingredient is provided. Here, the peptide is selected from the peptide including an amino acid sequence set forth in SEQ ID NO: 1, the peptides having a sequence homology of 80% or more with the amino acid sequence, or fragments thereof, that is, peptides having a therapeutic effect on ophthalmopathy by reducing a choroidal neovascularization activity.

In one aspect, the composition having a therapeutic effect on ophthalmopathy according to one aspect of the present invention may include the peptide including an amino acid sequence of SEQ ID NO: 1, the peptides having a sequence homology of 80% or more with the amino acid sequence, or the peptides as the fragments thereof at a content of 0.01 g/L to 1 kg/L, particularly 0.1 g/L to 100 g/L, and more particularly 1 g/L to 10 g/L, but the content of the peptide may be properly adjusted when there is a difference in effects according to the content. When the peptide is included within this content range or less, it is desirable for the peptide to have an intended effect of the present invention, and it is possible to satisfy all the stability and safety of the composition. Accordingly, it is desirable that the peptide is included within this content range in terms of cost effectiveness.

The composition according to one aspect of the present invention may be applied to all types of animals including a human, a dog, a chicken, a pig, cattle, a sheep, a guinea pig, or a monkey.

According to one aspect of the present invention, the composition is a pharmaceutical composition including the peptide including an amino acid sequence set forth in SEQ ID NO: 1, the peptides having a sequence homology of 80% or more with the amino acid sequence, or fragments thereof, that is, peptides having an inhibitory effect on neovascularization. The pharmaceutical composition according to one aspect of the present invention may be administered orally, intrarectally, percutaneously, intravenously, intramuscularly, intraperitoneally, intramedullarily, intradurally, or subcutaneously.

A formulation for oral administration may include a tablet, a pill, a soft or hard capsule, a granule, a powder, a liquid, or an emulsion, but the present invention is not limited thereto. A formulation for parenteral administration may include an injection, a drop, a lotion, an ointment, a gel, a cream, a suspension, an emulsion, a suppository, a patch, or a spray, but the present invention is not limited thereto.

The pharmaceutical composition according to one aspect of the present invention may include an additive such as a diluent, an excipient, a lubricant, a binding agent, a disintegrating agent, a buffer, a dispersing agent, a surfactant, a coloring agent, a flavoring agent, a sweetening agent, etc. when necessary. The pharmaceutical composition according to one aspect of the present invention may be prepared using conventional methods known in the related art.

In the pharmaceutical composition according to one aspect of the present invention, the dose of the active ingredient may vary depending on the age, sex, and weight of a target into which the composition is to be administered, pathological conditions and severity thereof, a route of administration, or the prescriber's judgement. The determination of a proper dose based on these factors is realized within the level of skill of a person of ordinary skill in the art. A daily dose of the composition may, for example, be in a range of 10 ng/kg/day to 10 mg/kg/day, particularly 0.1 μg/kg/day to 1 mg/kg/day, more particularly 1 μg/kg/day to 100 μg/kg/day, and most particularly 2 μg/kg/day to 50 μg/kg/day, but may be properly adjusted when there is a difference in effects according to the content. The pharmaceutical composition according to one aspect of the present invention may be administered once to three times a day, but the present invention is not limited thereto.

According to one aspect of the present invention, the composition is a food composition for inhibiting neovascularization, which includes the peptide including an amino acid sequence set forth in SEQ ID NO: 1, the peptides having a sequence homology of 80% or more with the amino acid sequence, or the peptides serving as the fragments thereof as an active ingredient.

A formulation of the food composition according to one aspect of the present invention is not particularly limited, but may, for example, be prepared into formulations such as a tablet, a granule, a powder, a liquid, a solid preparation, etc. A person having ordinary skill in the art may prepare each of the formulations by properly choosing and admixing components generally used in the related art in addition to the active ingredient, depending on the type of formulations or a purpose of use without any difficulty. In this case, a synergistic effect may be achieved when the components and other materials are applied together.

The terms used in this specification are is intended to be used to describe the specific exemplary embodiments, not to limit the present invention. Terms without numbers in front thereof are not to limit the quantity, but to show that there may be more than one thing about the term used. The terms “comprising,” “having,” “including,” and “containing” shall be interpreted as open terms (i.e., “including but not limited to”).

The mention of a numerical range is used instead of stating separate numbers within the range, so unless it is explicitly stated, the range should be construed as if all the numbers within the range are separately described herein. The end values of all the ranges are included in the range and can be combined independently.

Unless otherwise noted or clearly contradicting in context, all methods mentioned herein can be performed in a proper order. The use of any one embodiment and all embodiments, or exemplary languages (e.g., “˜”), unless included in the claims, is used to more clearly describe the present invention, not to limit the scope of the present invention. Any language herein outside of the claims should not be interpreted to be necessary for the present invention. Unless defined otherwise, technical and scientific terms used herein have the meanings ordinarily understood by a person skilled in the art to which the present invention belongs.

The preferred exemplary embodiments of the present invention include the best mode known to the inventors to practice the present invention. Variations in the preferred embodiments can become clear to those skilled in the art after reading the statements above. The present inventors expect that those skilled in the art can use the variations adequately and the present invention be practiced in other ways than listed herein. Thus, the present invention, as allowable by the patent law, includes equivalents, modifications and variations thereof, of the key points of the invention stated in the appended claims. In addition, all the possible variations within any combination of the above-mentioned components are included in the present invention, unless explicitly stated otherwise or contradicting in context. Although the present invention is described and shown with reference to the exemplary embodiments thereof, those skilled in the art will sufficiently understand that various changes and modifications can be made to the forms and details without departing from the spirit and scope of the prevent invention as defined by the claims below.

MODE FOR INVENTION

Hereinafter, the configurations and effects of the present invention will be described in further detail with reference to examples and experimental examples thereof. However, it should be understood that the following examples and experimental examples are merely provided to aid in understanding the present invention, but not intended to limit the scope of the present invention.

Example 1: Synthesis of Peptide

Synthesis of Peptide

A peptide including an amino acid sequence set forth in SEQ ID NO: 1 (hereinafter referred to as “PEP 1”) was prepared using a solid-phase peptide synthesis method known in the related art. Specifically, peptides were synthesized by coupling amino acids from the C-termini thereof one by one through Fmoc solid-phase peptide synthesis (SPPS) using ASP48S (Peptron, Inc., Daejeon ROK). The peptides having the first amino acid at the C-terminus attached to a resin were used, as follows:

NH2-Lys(Boc)-2-chloro-Trityl Resin

NH2-Ala-2-chloro-Trityl Resin

NH2-Arg(Pbf)-2-chloro-Trityl Resin

All the amino acid sources used to synthesize the peptides were protected by Fmoc at the N-terminus thereof, and the amino acid residues were protected by Trt, Boc, t-butylester (t-Bu), 2,2,4,6,7-pentamethyl dihydro-benzofuran-5-sulfonyl (Pbf), all of which were removed in an acid. Examples of the protected residues were as follows: Fmoc-Ala-OH, Fmoc-Arg(Pbf)-OH, Fmoc-Glu(OtBu)-OH, Fmoc-Pro-OH, Fmoc-Leu-OH, Fmoc-Ile-OH, Fmoc-Phe-OH, Fmoc-Ser(tBu)-OH, Fmoc-Thr(tBu)-OH, Fmoc-Lys(Boc)-OH, Fmoc-Gln(Trt)-OH, Fmoc-Trp(Boc)-OH, Fmoc-Met-OH, Fmoc-Asn(Trt)-OH, Fmoc-Tyr(tBu)-OH, Fmoc-Ahx-OH, Trt-Mercaptoacetic acid.

2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethylaminium hexafluorophosphate (HBTU)/N-hydroxybenzotriazole (HOBt)/4-methylmorpholine (NMM) were used as coupling reagents. Piperidine in 20% DMF was used to remove Fmoc. To separate the synthesized peptides from a resin or remove a protective group from the residues, a cleavage cocktail [trifluoroacetic acid (TFA)/triisopropylsilane (TIS)/ethanedithiol (EDT)/H₂O at a ratio of 92.5/2.5/2.5/2.5] was used.

Each of the peptides was synthesized by repeating the following processes: reacting amino acids, to which an amino acid protective group was coupled as starting materials, with a solid-phase scaffold in a state in which the corresponding amino acids were coupled to the scaffold, washing the scaffold with a solvent, and deprotecting the amino acids. The synthesized peptides were released from the resin, purified by HPLC, subjected to mass spectrometry (MS) to check whether the peptides were synthesized, and then freeze-dried.

The peptides used in this example were subjected to high-performance liquid chromatography. As a result, it was revealed that the purity of all the peptides was greater than or equal to 95%.

Specific peptide synthesis process for preparing a peptide PEP 1 was described, as follows.

1) Coupling

An amino acid (8 equivalents) protected with an NH₂-Lys(Boc)-2-chloro-trityl resin and coupling agents HBTU (8 equivalents)/HOBt (8 equivalents)/NMM (16 equivalents) dissolved in DMF were mixed together, and reacted at room temperature for 2 hours. Thereafter, the resulting reaction mixture was sequentially washed with DMF, MeOH, and DMF.

2) Fmoc Deprotection

Piperidine in 20% DMF was added, reacted twice at room temperature for 5 minutes, and then sequentially washed with DMF, MeOH, and DMF.

3) As a basic peptide backbone, NH2-E(OtBu)-A-R(Pbf)-P-A-L-L-T(tBu)-S(tBu)-R(Pbf)L-R(Pbf)-F-I-P-K(Boc)-2-chloro-trityl resin was prepared by repeating the aforementioned reactions 1) and 2).

4) Cleavage: a cleavage cocktail was added to the synthesized peptide resin to separate the synthesized peptide from the resin.

5) Cooling diethyl ether was added to the resulting mixture, and then centrifuged to precipitate the synthesized peptide.

6) After the peptide was purified by Prep-HPLC, the molecular weight of the peptide was confirmed by LC/MS. Then, the peptide was freeze-dried to be prepared in a powder form.

Example 2: Establishment of CNV Animal Model and Statistical Processing Method

Establishment of Laser-Induced CNV Mouse Model

Brown Norway rats were anesthetized, and pupils of the eyes were dilated using 0.5% phenylephrine (pupillary dilatation). The target rats having the dilated pupils of the eyes were irradiated with a 577 nm laser (577 nm, diode, 10 μm, 0.05 seconds) 6 to 8 times per eye to cause neovascularization in the choroid. Upon laser irradiation, the eyes were covered with a cover glass, and the rupture of Bruch's membranes was confirmed from the fact that bubbles occurred during irradiation with lasers using a slit lamp delivery system.

Classification of Experimental Groups According to Concentration of Administered Pep1

In a laser-induced CNV mouse model, the rats were randomized to experimental groups in which the peptide pep1 prepared by the method disclosed in Example 1 was administered at three doses of 0.1, 1, and 10 nM, and the control (vehicle) in which pep1 was not administered, and a drug was subcutaneously administered to the rats once a day for a period of time starting from the day before 3 days of laser irradiation to 2 weeks after the laser irradiation.

Statistic Processing

To compare the CNV activities between various groups, a Kruskal-Wallis test was used. In this case, the comparison between two groups was performed using a Mann-Whitney U test. A p value was considered to be statistically significant when the p value was less than 0.05.

Example 3: Measurement of CNV Thickness after Pep1 Administration

To check an effect on reduction of CNV, an experiment of measuring a CNV thickness was performed.

After CNV was induced with lasers, the rats in the groups in which pep1 was administered and the rats in the control were anesthetized after the elapse of 2 weeks, and then subjected to optical coherence tomography (OCT) to measure the CNV thickness in vivo.

The groups in which pep1 was administered and the control complied with the experimental groups disclosed in Example 2, and the thicknesses of all lesions in each of the groups were measured to check whether there was a difference in CNV thicknesses between the groups.

From the experimental results, it can be seen that the CNV thicknesses were reduced in all the groups in which pep1 was administered, compared to the thickness of the control in which pep1 was not administered after CNV induction (see FIG. 1).

When the experimental results were plotted on a graph through the statistical processing disclosed in Example 2, it can be seen that the CNV thicknesses were statistically significantly reduced in all the groups in which pep1 was administered at the concentrations (0.1, 1, and 10 nM), compared to the control. In particular, it can be seen that the CNV thicknesses were most drastically reduced in the group in which pep1 was administered at a concentration of 1 nM (see FIG. 2).

Example 4: Measurement of CNV Area after Pep1 Administration

To check an effect on reduction of CNV, an experiment of measuring a CNV area was performed.

After CNV was induced with lasers, eyeballs of the rats in the groups in which pep1 was administered and the rats in the control were extracted after the elapse of 2 weeks, and eye lenses and vitreous bodies were removed to obtain retinal pigment epithelium-choroid-sclera tissues. An area of tissues stained with isolectin specific to vascular endothelial cells was measured to determine CNV areas in the control and the groups in which pep1 was administered.

The groups in which pep1 was administered and the control complied with the experimental groups disclosed in Example 2, and the thicknesses of all lesions in each of the groups were measured to check whether there was a difference in CNV areas between the groups.

From the experimental results, it can be seen that the CNV areas were reduced in all the groups in which pep1 was administered, compared to the area of the control in which pep1 was not administered after CNV induction (see FIG. 3).

When the experimental results were plotted on a graph through the statistical processing disclosed in Example 2, it can be seen that the CNV areas were statistically significantly reduced in all the groups in which pep1 was administered at the concentrations (0.1, 1, and 10 nM), compared to the control. In particular, it can be seen that the CNV areas were most drastically reduced in the group in which pep1 was administered at a concentration of 1 nM (see FIG. 4).

Example 5: Measurement of Angiographic Leakage after Pep1 Administration

To check an effect on reduction of CNV, an experiment of measuring angiographic leakage in the choroid was performed.

After CNV was induced with lasers, the rats in the groups in which pep1 was administered and the rats in the control were anesthetized after the elapse of 2 weeks, and a contrast medium was intraperitoneally injected at a dose of 0.1 mL (10% fluorescein disodium salt). Levels of angiographic leakage in the choroid between the control and the groups in which pep1 was administered were compared using fluorescein angiography (FAG).

The groups in which pep1 was administered and the control complied with the experimental groups disclosed in Example 2, and the leakage levels at all lesions in each of the groups were measured to check whether there was a difference in angiographic leakage in the choroid between the groups.

From the experimental results, it can be seen that the leakage levels were reduced in all the groups in which pep1 was administered at the concentrations (0.1, 1, and 10 nM), compared to the leakage level of the control in which pep1 was not administered after CNV induction (see FIG. 5).

All the lesions in each of the groups were graded according to the leakage levels, and the ratios of the lesions with respect to the grades in each of the groups were plotted on a graph (see FIG. 6). The grades were indicated as follows: Grade 1 (a clinically mild leakage level), Grade 2A (a clinically mean leakage level), and Grade 2B (a clinically severe leakage level). It was confirmed that the ratios of the lesions with Grade 2B in which the leakage level was severe were reduced in all the groups in which pep1 was administered at the concentrations, compared to the ratios of the control. In particular, it can be seen that the ratios of the Grade 2B lesions were drastically reduced when pep1 was administered at concentrations of 1 and 10 nM.

When the results of Examples 1 to 5 were combined, the three CNV activities including the CNV thickness, the CNV area and the ratio of lesions according to the level of angiographic leakage were measured. As a result, it was revealed that the CNV activities were reduced when pep1 was administered. That is, it was proven that pep1 was effective in treating and preventing CNV-associated ocular diseases by reducing the CNV activities. Therefore, it can be seen that the composition including pep1 was probably used as the pharmaceutical composition for treating and preventing ocular diseases so as to treat and prevent the ocular diseases. 

What is claimed is:
 1. A method of inhibiting choroidal neovascularization, comprising: administering to a subject in need thereof an effective amount of an isolated peptide consisting of the amino acid sequence of SEQ ID NO:
 1. 2. The method of claim 1, wherein the peptide is administered at a daily dose of 10 ng/kg to 10 mg/kg.
 3. The method of claim 1, wherein the peptide is administered at a daily dose of 2 μg/kg to 50 μg/kg.
 4. The method of claim 1, wherein the peptide is administered 1 to 3 times a day.
 5. A method of inhibiting choroidal neovascularization, comprising: administering to a subject in need thereof a composition comprising an effective amount of an isolated peptide consisting of the amino acid sequence of SEQ ID NO:
 1. 6. The method of claim 5, wherein the composition further comprises a pharmaceutically acceptable excipient and an additive.
 7. The method of claim 5, wherein the composition is a food composition.
 8. The method of claim 5, wherein the composition comprises 0.01 g/L to 1 kg/L of the peptide.
 9. The method of claim 5, wherein the composition comprises 1 g/L to 10 g/L of the peptide.
 10. The method of claim 5, wherein the peptide is administered at a daily dose of 10 ng/kg to 10 mg/kg.
 11. The method of claim 5, wherein the peptide is administered at a daily dose of 2 μg/kg to 50 μg/kg.
 12. The method of claim 5, wherein the peptide is administered 1 to 3 times a day. 